Green’s Dictionary of Slang

a phr. used by leering men observing a woman with large breasts.

1984		Partridge DSUE (8th edn) 1364/2: [...] C.20.
2005		‘UK Snowy’ ‘Able to Fuck’ at asstr.org 🌐 ‘You don’t get many of those to the pound, man,’ chuckled Winston.